Self-Pulsation at Zero Absorber Bias in GaN-Based Multisection Laser Diodes

We study the influence of pump current and absorber bias voltage on the pulse width and frequency of sustained pulsation in GaN-based multisection laser diodes. The observed frequencies and pulse widths range from 1.5 to 4.5 GHz and 90 to 18 ps, respectively. Negative absorber bias is found to reduc...

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Published inApplied physics express Vol. 4; no. 6; pp. 062702 - 062702-3
Main Authors Scheibenzuber, Wolfgang G, Hornuss, Christian, Schwarz, Ulrich T, Sulmoni, Luca, Dorsaz, Julien, Carlin, Jean-Fran\{c}ois, Grandjean, Nicolas
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.06.2011
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Summary:We study the influence of pump current and absorber bias voltage on the pulse width and frequency of sustained pulsation in GaN-based multisection laser diodes. The observed frequencies and pulse widths range from 1.5 to 4.5 GHz and 90 to 18 ps, respectively. Negative absorber bias is found to reduce the pulsation frequency and increase the pulse width. This behavior is explained by the tuneability of absorption and charge carrier lifetime in the absorber via the applied bias voltage.
Bibliography:Schematic drawing of the self-pulsating multisection laser diode (not to scale). Average output power and absorber photocurrent as a function of gain section current for different bias voltages in continuous current operation. The inset shows the threshold current as a function of absorber bias voltage. Measured charge carrier lifetime $\tau$ in the absorber as a function of applied bias voltage. The asymmetric error bars are due to a systematic overestimation of the decay time because of the finite fall time of the electric pulse. The inset shows an example logarithmic plot of the electroluminescence decay at $-3$ V bias, where the decay time is obtained from a linear fit at the end of the electric pulse (dashed line). (a) Example streak camera trace of self-pulsation at 0 V absorber bias and 155 mA gain section current. (b) Oscillation frequency and pulse width of the initial pulse as functions of pump current for different bias voltages. The inset shows the pulse shape at 0 V absorber bias and 173 mA gain section current. Peak power of single pulses as a function of current for different bias voltages.
ISSN:1882-0778
1882-0786
DOI:10.1143/APEX.4.062702